<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #div1{
      width:400px;
      height:400px;
      background:white;
    }
    body{
      margin:0;
      background: black;
    }
  </style>
</head>
<body>
<div id="div1">
  <svg id="svg1" xmlns="http://www.w3.org/2000/svg" width="100%" height="100%">
    <!--
      M100 100A 100(X半径) 100(Y半径) 0(角度,正圆无所谓,适用于椭圆) 0(0代表小弧,1代表大弧) 0(0代表逆时针,1代表顺时针) 200 200
    -->
    <path d="M150 150 A 100 100 0 0 1 250 150 L225 175 A 50 50 0 0 0 175 175 Z" stroke="black" stroke-width="5" fill="none"></path>
  </svg>
</div>
<script>
  window.onload = function(){}
</script>
</body>
</html>
